package com.cqan.security;

import java.util.Collection;
import java.util.Iterator;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.SecurityConfig;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;


/**
 * @author slaton
 *
 * 下午04:58:37
 */
@Service("securityAccessDecisionManager")
public class SecurityAccessDecisionManager implements AccessDecisionManager {

	private static final Logger logger = LoggerFactory.getLogger("ds.debug"); 
	 
	 public void decide(Authentication authentication, Object object,
             Collection<ConfigAttribute> configAttributes)
            throws AccessDeniedException, InsufficientAuthenticationException {
        if(configAttributes == null){
        	throw new AccessDeniedException("no right");
         }
        logger.debug("url is {}",object.toString());  //object is a URL.
         Iterator<ConfigAttribute> ite=configAttributes.iterator();
        while(ite.hasNext()){
             ConfigAttribute ca=ite.next();
             String needRole=((SecurityConfig)ca).getAttribute();
            for(GrantedAuthority ga:authentication.getAuthorities()){
                if(needRole.equals(ga.getAuthority())){  //ga is user's role.
                    return;
                 }
             }
         }
        throw new AccessDeniedException("no right");
     }

     @Override
    public boolean supports(ConfigAttribute attribute) {
       
        return true;
     }

     @Override
    public boolean supports(Class<?> clazz) {
        return true;
     }

}
